﻿// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

using BootstrapBlazor.Localization.Json;
using Microsoft.Extensions.Localization;
using System.Collections;
using System.ComponentModel.DataAnnotations;

namespace BootstrapBlazor.Components;

/// <summary>
/// Required 验证实现类
/// </summary>
class RequiredValidator : ValidatorBase
{
    /// <summary>
    /// 获得/设置 是否允许空字符串 默认 false 不允许
    /// </summary>
    public bool AllowEmptyString { get; set; }

    /// <summary>
    /// 获得/设置 IStringLocalizerFactory 注入服务实例 默认为 null
    /// </summary>
    public IStringLocalizerFactory? LocalizerFactory { get; set; }

    /// <summary>
    /// 获得/设置 Json 资源文件配置 默认为 null
    /// </summary>
    public JsonLocalizationOptions? Options { get; set; }

    /// <summary>
    /// 验证方法
    /// </summary>
    /// <param name="propertyValue">待校验值</param>
    /// <param name="context">ValidateContext 实例</param>
    /// <param name="results">ValidateResult 集合实例</param>
    public override void Validate(object? propertyValue, ValidationContext context, List<ValidationResult> results)
    {
        var errorMessage = GetLocalizerErrorMessage(context, LocalizerFactory, Options);
        var memberNames = string.IsNullOrEmpty(context.MemberName) ? null : new string[] { context.MemberName };
        if (propertyValue == null)
        {
            results.Add(new ValidationResult(errorMessage, memberNames));
        }
        else if (propertyValue.GetType() == typeof(string))
        {
            var val = propertyValue.ToString();
            if (!AllowEmptyString && val == string.Empty)
            {
                results.Add(new ValidationResult(errorMessage, memberNames));
            }
        }
        else if (typeof(IEnumerable).IsAssignableFrom(propertyValue.GetType()))
        {
            var v = propertyValue as IEnumerable;
            var index = 0;
            foreach (var item in v!)
            {
                index++;
                break;
            }
            if (index == 0)
            {
                results.Add(new ValidationResult(errorMessage, memberNames));
            }
        }
    }
}
